The blancmange curve is the set of points (x,y) such that 0 x 1 and ,
where s(x) = the distance from x to the nearest integer.
The area under the blancmange curve is equal to ½, shown in pink in the diagram below.
Let C be the circle with centre (¼,½) and radius ¼, shown in black in the diagram.
What area under the blancmange curve is enclosed by C?
Give your answer rounded to eight decimal places in the form 0.abcdefgh